6-K

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16 OF

THE SECURITIES EXCHANGE ACT OF 1934

For the month of October 2018

Commission File Number 1-14858

CGI Group Inc.

(Translation of Registrant’s Name Into English)

1350 René-Lévesque Boulevard West

25th Floor

Montreal, Quebec

Canada H3G 1T4

(Address of Principal Executive Offices)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

o  Form 20-F        x  Form 40-F

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1): ____

Note: Regulation S-T Rule 101(b)(1) only permits the submission in paper of a Form 6-K if submitted solely to provide an attached annual report to security holders.

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7): ____

Note: Regulation S-T Rule 101(b)(7) only permits the submission in paper of a Form 6-K if submitted to furnish a report or other document that the registrant foreign private issuer must furnish and make public under the laws of the jurisdiction in which the registrant is incorporated, domiciled or legally organized (the registrant’s “home country”), or under the rules of the home country exchange on which the registrant’s securities are traded, as long as the report or other document is not a press release, is not required to be and has not been distributed to the registrant’s security holders, and, if discussing a material event, has already been the subject of a Form 6-K submission or other Commission filing on EDGAR.

The following are filed herewith and incorporated herein:

Exhibit Number	Description
99.1	Notice of Change in Auditor, dated September 28, 2018.
99.2	Confirmation of Ernst & Young, LLP, dated October 2, 2018.
99.3	Confirmation of PricewaterhouseCoopers LLP, dated October 2, 2018.

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	CGI GROUP INC.
	(Registrant)
Date: October 9, 2018	By:	/s/ Benoit Dubé
		Name:	Benoit Dubé
		Title:	Executive Vice-President, Chief Legal
			Officer and Corporate Secretary

EX-99.1

NOTICE OF CHANGE OF AUDITOR

Pursuant to NI 51-102 (Section 4.11)

TO:

Ernst & Young LLP PricewaterhouseCoopers LLP

AND TO:

Autorité des marchés financiers Alberta Securities Commission British Columbia Securities Commission Financial and Consumer Affairs Authority of Saskatchewan Financial and Consumer Services Commission (New Brunswick) The Manitoba Securities Commission Nova Scotia Securities Commission Office of the Superintendent of Securities (Prince Edward Island) Office of the Superintendent of Securities, Service Newfoundland and Labrador Ontario Securities Commission

CGI Group Inc. (the "Corporation") hereby gives notice pursuant to Section 4.11 of National Instrument 51-102 - Continuous Disclosure Obligations ("NI 51-102") of the termination of Ernst & Young LLP (the "Former Auditor") as the auditor of the Corporation and the appointment of PricewaterhouseCoopers LLP (the "Successor Auditor") in its place. The Corporation confirms that:

1. The Audit and Risk Management Committee ("ARMC") has conducted a review of external audit services. As part of their review, the ARMC sought proposals to provide audit services for the financial year ending on September 30, 2019.

2. After careful review of the proposals received and due consideration of all relevant factors, the ARMC recommended to the Board of Directors that the Successor Auditor, and not the Former Auditor, be proposed for appointment as auditor of the Corporation by the shareholders of the Corporation for the Corporation's financial year ending on September 30, 2019.

3. On September 25, 2018, the Board of Directors approved the recommendation of the ARMC indicated above and decided not to propose the Former Auditor for reappointment as auditor of the Corporation for the financial year ending on September 30, 2019 and to propose the Successor Auditor for appointment as the auditor of the Corporation by the shareholders of the Corporation for the Corporation's financial year ending on September 30, 2019. The vote will take place at the annual general meeting of shareholders of the Corporation scheduled to be held on January 30, 2019.

4. The auditor’s reports of the Former Auditor on the annual audited consolidated financial statements of the Corporation for the two most recent financial years preceding the date of this notice, being reports for the financial years ended September 30, 2017 and September 30, 2016, and with any subsequent period to date did not express any modified opinion.

5. In the opinion of the Corporation, there are no reportable events as such term is defined in Section 4.11(1) of NI 51-102.

DATED as of the 28^th day of September, 2018.

	CGI GROUP INC.
By:	(s) François Boulanger
	François Boulanger Executive Vice-President and Chief Financial Officer

EX-99.2

October 2, 2018 Autorité des marchés financiers Alberta Securities Commission British Columbia Securities Commission Financial and Consumer Affairs Authority of Saskatchewan Financial and Consumer Services Commission (New Brunswick) The Manitoba Securities Commission Nova Scotia Securities Commission Office of the Superintendent of Securities (Prince Edward Island) Office of the Superintendent of Securities, Service Newfoundland and Labrador Ontario Securities Commission Re: CGI Group Inc. Notice of Change of Auditor dated September 28, 2018 Dear Sirs/Mesdames: Pursuant to National Instrument 51-102 (Part 4.11), we have read the above-noted Change of Auditor Notice and confirm our agreement with the information contained in the Notice pertaining to our firm. Yours sincerely, c.c. The Board of Directors, CGI Group Inc François Boulanger, Executive Vice-President and Chief Financial Officer

EX-99.3

October 2, 2018 To: Autorité des marchés financiers Alberta Securities Commission British Columbia Securities Commission Financial and Consumer Affairs Authority of Saskatchewan Financial and Consumer Services Commission (New Brunswick) The Manitoba Securities Commission Nova Scotia Securities Commission Office of the Superintendent of Securities (Prince Edward Island) Office of the Superintendent of Securities, Service Newfoundland and Labrador Ontario Securities Commission We have read the statements made by CGI Group Inc. in its notice of change of auditor dated September 28, 2018, which we understand will be filed pursuant to Section 4.11 of National Instrument 51-102. We agree with the statements concerning PricewaterhouseCoopers LLP in the notice of change of auditor dated September 28, 2018. Yours very truly, Partnership of Chartered Professional Accountants PricewaterhouseCoopers LLP/s.r.l./s.e.n.c.r.l. 1250 René-Lévesque Boulevard West, Suite 2500, Montréal, Quebec, Canada H3B 4Y1 T: +1 514 205 5000, F: +1 514 876 1502, www.pwc.com/ca “PwC” refers to PricewaterhouseCoopers LLP/s.r.l./s.e.n.c.r.l., an Ontario limited liability partnership.